my copy of pokemon silver cartridge shipped with a bad save battery. i'd only be able to get to the fourth gym or so before the batteries in my gameboy would die.
Amazon.com: CR1616 Batteries with Tabs,12 Pack CR1616 Lithium Replacement Save Battery for Nintendo Game Boy, GB Color, Advance and Pokemon Games : Video Games
How to change a Game Boy game battery without soldering - Gamer By Mistake
How to Spot a Fake (Pirated) Gameboy Advance Cartridge
How to replace a GameBoy cartridge battery without losing saved data - Gamer By Mistake
GBA] Pokemon Ruby & Sappire Battery | GBAtemp.net - The Independent Video Game Community